London Wasps back-row Viliami 'Billy' Vunipola is one of the rising stars of the English game and will play for Saracens in the 2013-14 season.

Sydney-born Vunipola is a former England U18 and U20 international who was drafted into the senior training squad ahead of the 2013 Six Nations on the back of a rich vein of form for his Premiership club.

He is part of a distinguished Tongan rugby dynasty, his brother Mako being a a current England international. Their father Fe'ao, a hooker won 32 caps for his country, figured in the 1995 and 1999 World Cups and played for Pontypool. Six of Billy's uncles and his grandfather also represented Tonga.

Educated at the Castle School, Bristol, he went on to Harrow and qualified for England through residency.